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Regulation of mammary gland remodeling during the lactation cycle in cattle still remains unclear. The present study focused on the role of TGF-ß1 and somatotropic pathways proteins in control of the switch between survival and death of bovine mammary epithelial cells (MEC). Expressions of TGF-ß1, TGF-ßRII, IGF-IRα, IGF-IRß, GH-R, IGFBP-3, -4, and -5 in mammary tissue explants in Holstein-Fresian...
A variable TG-repeat polymorphism was studied in the bovine growth hormone receptor (GHR) gene 5’-noncoding region. A total of seven alleles of the GHR gene were detected in six breeds. The length of the PCR-amplified variable region was from 306 to 320 bp, corresponding to 14 to 21 TG-repeats.Three additional alleles not reported so far, with 14, 19, and 21 TG-repeats were found. The associations...
The study based on use of VIA for estimation of beef quality from four beef breeds: Limousine, Charolaise, Angus, Hereford and cross-breed Black-andWhite x Piemontese were performed. The average values of colour components R and G estimated with a VIA method differed statistically between the investigated breeds. The marbling of the MLD cross-section was for each beef breed significantly diversified...
The association was studied between the polymorphism at leptin (LEP), Pit1, and STAT5A loci and meat production traits in 145 Black-and-White growing/fattening bulls. Genotypes of LEP, Pit1 and STAT5A were determined with the PCR-RFLP technique. Over the 8th month of age the 28-day performance test was introduced to assess growth rate and feed conversion during which the fullconcentrate diet was offered...
Two-hundred-sixty-five young cattle of both sexes, progeny of thirty-one Polish Friesian AI bulls were genotyped for growth hormone (GH), κ-casein (CSN3), and β-lactoglobulin (LGB) gene variants.Associations were evaluated between genetic variants in the three loci and concentration of triiodothyronine (T3), thyroxine (T4), insulin (Ins), glucose (Glu), urea (Ur), creatinine (Cr), cholesterol (Chol),...
STAT5 is a group of transcription factors that mediate signals from prolactin and growth hormone. Therefore, STAT5A gene is a candidate marker for quantitative traits in farm animals. In this study the new nucleotide sequence polymorphism was found in the coding region of the bovine STAT5A gene - substitution C→T at position 6853 within the exon 7. As this mutation creates new AvaI/DdeI restriction...
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